羊毛脂
A．硬脂醇220gB．十二烷基硫酸钠15gC．白凡士林250gD．羟苯乙酯0.25gE．丙二醇120g水加至1000g
参考答案：A
It will be more than 100 years ____ the country begins once again to look as it did before.
A．when
B．since
C．before
D．that
首位不是0的6位二进制数可表示的数的范围是______。
A．31～64
B．32～64
C．32～63
D．64～127
